Lathe-center



L-. BEEMAN.

- LATHE CENTER. I

APPLICATION FILED APR. 14, 1919. RENEWED MAY 12. 1921.

1,399,921, 'A Patented Dec.13, 1-921.

WITNESSES.

m wj

ATTORNEY.

UVNITQED 's'r"A-1"Es PATENT ore-Ice.

LYLE 3mm, or mwnuxnn, wIsconsm-,nss1e1ron 'ro murncrcnnns' mnwm CORPORATION, or mwnuxm wrsconsm, n ,conrom'rron OI WISCONSIN.

Specification of Letters Patent.

mum-m.

Application filed April 14,1919, Serial a... 289,908. Renewed May 12,- 1921. seria in. 488,977.

' which the followin is a description, reference being had tot e accompanyin drawin? which are a art of this spec' cation. I he invention re ates to lathe-centers and has for. its'object to produce a construction which will conserve the time of the lathe operator and will save material ordinarily wasted'in devices of this kind.

The usual form of lathe-center is made in one piece of tool steel. Unless care is taken to oil the centerhole in the material before putting the work on the lathe, and at intervals during the turning of the piec'e, the point burns ofl? and this necessitates regrmding the lathe-center for a new pomt. But the frequent regrindini ter to such an extent t at the shank portion has tobe, thrown away and is therefore wasted. To obviate these difiiculties I have provided a lathe-center in which a tool steel point is removably secured to a machine steel shank andanoil reservoiris formed 1n the shank and connects with the point through a conduit so that the center hole in thema terial will be automatically oiled during the turning operation, thus saving the'time brdinaril consumed in oiling the .center. hole in t e material before and during the turning operation, and also saving the ma- 1 terial of the center itself by using renewable ready 'sion hereof.

oints with acommon shank, the shank'bemg of less ex nsive material.

A further 0 ject of the invention s to provide an. efiicient connection between the renewable point and the shank which will properly. distribute the thrust from the point to the shank and W111 also permit of removal'of the point from the shank. The invention further consists in the several features hereinafter described and more particularly defined by claims at the conclu- In the drawin' Figure 1 is aside view of the device em 2 is a section taken on the line 2.-2 0

section through the headtaken. on the line of Fig. 1 ;.'Fig. 4= is, an end view of a wears down the com in the shank' dyin the invention' Fig, 1

g Fig.v terfromentering into the reservom' The go is a top view of the device with a reservoir 12communicates with the space 17 device ;--Fig. 5' is an end view ofthe device used for small work.

- Patented Dec,13,-192 1.-

In the drawingsthe numeral-'fi designates the, sh'ank'of the lathe-center, which is pref er'abl .made-of machine steel, and 7 are.-

newa le point." To connect theparts 6 andv 7 together so .that' the point may bereadily I removed and so that the same may be securely held on theshank when in use and .pro erly transmit the thrust from thework I to t eshank, said point is provided with a i tapered bore8 in 1ts rear end 9 and the shank isprovided' with a correspondingly tapered pro ectlon 10 fittingin the bore 8 and a, shoulder portion 11. The taper fit f between-these parts should be such as to per-.

mit easy removal of thepoint from ;the-

shank so that. the points may be interchanged without excessive binding and at the same time it should be suflicient to hold the point on the shankagainst rotation durmg the turning operation, and I have found that a taper of about twelve and one-half 'deg lices is very satisfactory.

eftaer fit is such'that point is 's lghtly spaced from the shouldered portion 11 of thefishank until the tail-stock the end the i carryin the center is brought up' against the wor andithen the rear end of the point 7 abuts against the shoulder 11 so, that the thrusts transmitted to the point" will be transmitted both to the tapered ortion and shoulderedi portion of the shank and thus" prevent-wearof the tapered connection between the parts 6' and 7. ,With this construction, as soonas the point wears down it may" be readil replaced, the oint being preferably ma e of tool steel. Rhe connec-' tion' also has ,the advantage of permitting the removallofthe, oint without the ne-*;

cessity ofiremoving' t e shank of the center from the tail-stock of; the lathe.

' To prevent; burning of the point and also to save time,ban .oil reservoir 1211s formed a conduit 13 communicates withhithe inner tightly fitted therei hinged "cap'15 provided withaj spring hinge end of the reservoir findhas a-filling. tube14 which tube. carries a y providing a bore therein and between-the end-of thetapered bore 8 in the outlet upon the material being turned by the tool will not prevent the flow of oil from the lathe-center to the center hole in the material being turned and there is a constant flow of oil from the reservoir 12 through the point to the work.

For small Work the point is so small that the conduit for conducting the oil through the point cannot be led off at one side there'- of, and consequently in this case the conduit 18 passes through the point and a short groove leads from the point atone side.

- he action of this smaller device is the same I as that previously described and the groove 25 is similarly disposed opposite to the pressure being exerted upon the work.

The groove adjacent the conduit in each case allows the oil to fiow back to some exv I tent from the point. WltlliihlS construction,

on the filling of the; oil reservoir through the tube 14 the operator does not have to oil up the center hole of the stock before starting operations, nor does he subsequently.

have to stop work and oil up the center to prevent burning of the lathe-center point as there is a constant flow of oil furnished to the point and-when the point becomes dull or worn down it may be readily replaced by a new one.

What I claim as new and desire to secure by Letters Patent is:

' 1. In a lathe-center, the combination of a shank provided with a tapered end and a.

shouldered portion: adjacent said tapered end, a renewable point provided with .a tapered bore into which said tapered end fits, the end of the point adjacent said bore abutting against said shouldered portion when the point is held to the work, and means for furnishing oil to the tip of the point.

2. In a lathe-center, the combination of a shank having a tapered end with a shouldered portion adjacent thereto, a bore in said tapered end forming an oil reservoir, a filling opening for said reservoir provided w1th a ustproof ca a renewable po1nt having a tapered bore tting on the tapered end of the shank and having its end adjacent said bore adapted to abut against the shouldered portion of the shank, the tapered bore in the point communicating with the reservoir in the shank, and a conduit for conducting oil from the reservoir through the point to the outer end thereof.

In testimony whereof, I a fiix my signature, in presence of two witnesses.

LYLE BEEMAN. Witnesses:

R. S. C. CALDWELL, H. D. CHASE. 

